The 12 Bar Blues in A# contains the chords C#7 (I chord), F#7 (IV chord) and G#7 (V chord). Below is the 12 Bar Blues starting on C#7.
12 Bar Blues in C#7 (Jazz Variation)
The Jazz variation of the 12 Bar Blues in C sharp adds some extra chords. The 12 Bar Blues structure remains the same, but certain chords are substituted. For example, the C#7 chord in the fourth bar is substituted with an G#m7 moving to an C#7 chord.